Hi Sprinkles,
You are welcome.
I don't select a date using a tong shu. It is inaccurate. However, everyday has a purpose and this is in the tong shu as well. And we have a system or formula to plot this out, so i know which day is not good, hence i will not advise using these days. But this is the first layer of analysis only.
13th Feb is not a bad day by default, But when tong shu is out, it can still list it as bad. Only way to use this date will be to check that both your bazi fits this day.
Hope this helps.